You could easily take down Maestro. Any 4/40 champ can outdamage the regen on all but the easy path (there’s no regen at all there) just look up some maestro tips on YouTube and you will be set.
Uncollected on the other hand, definitely not without revives. You have some really good champs for Act 5 like Stark Spidy, Hyperion, X23 KM and Blade, but they need to be all at LEAST rank 4/40 and preferably higher.
you should be able to, i beat him with 4* NC, Void unduped, quake, and dormamu and WS, both 2/35. Maestro isn't that hard too beat, his sp can be dodge easily. with that team you should be able to beat him without revives or even health potions
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Uncollected on the other hand, definitely not without revives. You have some really good champs for Act 5 like Stark Spidy, Hyperion, X23 KM and Blade, but they need to be all at LEAST rank 4/40 and preferably higher.